code: def _rayify_task(
      task,
      key,
      deps,
      ray_presubmit_cbs,
      ray_postsubmit_cbs,
      ray_pretask_cbs,
      ray_posttask_cbs,
      ray_remote_args,
  ):
      """
      Rayifies the given task, submitting it as a Ray task to the Ray cluster.
  
      Args:
          task: A Dask graph value, being either a literal, dependency
              key, Dask task, or a list thereof.
          key: The Dask graph key for the given task.
          deps: The dependencies of this task.
          ray_presubmit_cbs: Pre-task submission callbacks.
          ray_postsubmit_cbs: Post-task submission callbacks.
          ray_pretask_cbs: Pre-task execution callbacks.
          ray_posttask_cbs: Post-task execution callbacks.
          ray_remote_args: Ray task options.
  
      Returns:
          A literal, a Ray object reference representing a submitted task, or a
          list thereof.
      """
      if isinstance(task, list):
          # Recursively rayify this list. This will still bottom out at the first
          # actual task encountered, inlining any tasks in that task's arguments.
          return [
              _rayify_task(
                  t,
                  key,
                  deps,
                  ray_presubmit_cbs,
                  ray_postsubmit_cbs,
                  ray_pretask_cbs,
                  ray_posttask_cbs,
                  ray_remote_args,
              )
              for t in task
          ]
      elif istask(task):
          # Unpacks and repacks Ray object references and submits the task to the
          # Ray cluster for execution.
          if ray_presubmit_cbs is not None:
              alternate_returns = [
                  cb(task, key, deps) for cb in ray_presubmit_cbs
              ]
              for alternate_return in alternate_returns:
                  # We don't submit a Ray task if a presubmit callback returns
                  # a non-`None` value, instead we return said value.
                  # NOTE: This returns the first non-None presubmit callback
                  # return value.
                  if alternate_return is not None:
                      return alternate_return
  
          func, args = task[0], task[1:]
          if func is multiple_return_get:
              return _execute_task(task, deps)
          # If the function's arguments contain nested object references, we must
          # unpack said object references into a flat set of arguments so that
          # Ray properly tracks the object dependencies between Ray tasks.
          arg_object_refs, repack = unpack_object_refs(args, deps)
          # Submit the task using a wrapper function.
          object_refs = dask_task_wrapper.options(
              name=f"dask:{key!s}",
              num_returns=(
                  1
                  if not isinstance(func, MultipleReturnFunc)
                  else func.num_returns
              ),
              **ray_remote_args,
          ).remote(
              func,
              repack,
              key,
              ray_pretask_cbs,
              ray_posttask_cbs,
              *arg_object_refs,
          )
  
          if ray_postsubmit_cbs is not None:
              for cb in ray_postsubmit_cbs:
                  cb(task, key, deps, object_refs)
  
          return object_refs
      elif not ishashable(task):
          return task
      elif task in deps:
          return deps[task]
      else:
          return task
  
imports: import atexit
  import threading
  from collections import defaultdict
  from collections import OrderedDict
  from dataclasses import dataclass
  from multiprocessing.pool import ThreadPool
  from typing import Optional
  import ray
  import dask
  from dask.core import istask, ishashable, _execute_task
  from dask.system import CPU_COUNT
  from dask.threaded import pack_exception, _thread_get_id
  from ray.util.dask.callbacks import local_ray_callbacks, unpack_ray_callbacks
  from ray.util.dask.common import unpack_object_refs
  from ray.util.dask.scheduler_utils import get_async, apply_sync
label_desc: Use image node_id 6 for calling a global function with example usage: _rayify_task(task, key, deps, ray_presubmit_cbs, ray_postsubmit_cbs, ray_pretask_cbs, ray_posttask_cbs, ray_remote_args) and returns: unknown, object_refs, _execute_task, task, deps, task, alternate_return